Quarterly report pursuant to Section 13 or 15(d)

DEBT - Schedule of Debt (Details)

v3.20.2
DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 07, 2012
Debt Instrument [Line Items]      
Long-term debt $ 645,805 $ 561,124  
Less short-term borrowings and current maturities of long-term debt (63,541) (45,739)  
Total long-term debt 582,264 515,385  
Secured Debt      
Debt Instrument [Line Items]      
Long-term debt 17,485 0  
Secured Debt | Era      
Debt Instrument [Line Items]      
Long-term debt   17,900  
Secured Debt | PK Air Debt      
Debt Instrument [Line Items]      
Long-term debt 202,811 207,326  
Secured Debt | Macquarie Debt      
Debt Instrument [Line Items]      
Long-term debt 146,695 148,165  
Secured Debt | Lombard Debt      
Debt Instrument [Line Items]      
Long-term debt 134,468 136,180  
Secured Debt | Airnorth Debt      
Debt Instrument [Line Items]      
Long-term debt 7,172 7,618  
Secured Debt | Humberside Debt      
Debt Instrument [Line Items]      
Long-term debt 334 335  
Senior Notes | 7.750% Senior Notes      
Debt Instrument [Line Items]      
Long-term debt 136,840 0  
Total long-term debt $ 136,800    
Stated interest rate 7.75%   7.75%
Senior Notes | 7.750% Senior Notes | Era      
Debt Instrument [Line Items]      
Long-term debt   142,000  
Term Loan      
Debt Instrument [Line Items]      
Long-term debt $ 0 $ 61,500